DRAFT
2026-05-29 12:32:42
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.159....1K
ePESSTO+ spectroscopic classification of optical transients
Authors: J. Khaulsay (Cardiff), S. Vazhayil (UDP), A. Aryan, C.-H. Lai, A. Dutta, T.-W. Chen (NCU) J. Sollerman (Stockholm), S. Srivastav (Oxford), T. Petrushevska (UNG), J. Anderson (ESO), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (Trinity), P. Pessi (Warsaw), O. Yaron (Weizmann), D. Young (QUB), A. Horowicz (Weizmann), J. Tonry, L. Denneau, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), S. J. Smartt, K. W. Smith (Oxford/QUB), H. Stevance (Oxford), D. R. Young, M. Fulton, M. McCollum, T. Moore, M. Nicholl, J. Weston (QUB), L. Shingles (GSI/QUB), L. Rhodes (Oxford), J. Sommer (LMU/QUB), A. Rest (STScI), C. Stubbs (Harvard)
Source Group: ePESSTO+
Keywords: Spectroscopy, Transient, Supernova, Optical
Abstract:
This report contains one Type Ia and one Type II supernova

ePESSTO+, the advanced Public ESO Spectroscopic Survey for Transient Objects (Smartt et al. 2015 2015A&A...579A..40S), reports the following supernova classifications.

Targets were supplied by ATLAS survey (Smith et al. 2020 2020PASP..132h5002S),  and Gravitational-wave Optical Transient Observer GOTO (see Dyer et al. 2020, SPIE, 11445 2020SPIE11445E..7GD). 

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2026 May 28, using EFOSC2 and Grism 11 (3345-7470, 14A resolution). Classifications were done using SNID-SAGE (Stoppa F., Smartt S.~J., 2026, arXiv, arXiv:2603.28741. doi:10.48550/arXiv.2603.28741), and DASH (Muthukrishna et al. 2019  2019ApJ...885...85M).

The classification spectra and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.

The classified objects are listed in the Related Objects table below.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Source Phase (days) Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2026nbd [GOTO26eyc] 14:48:38.822 +18:16:34.84 SN Ia-SC 0.04 WISEA J144838.80+181634.9 0.04 GOTO Pre-peak Redshift from host galaxy lines. Phase from ATLAS light curve. Classification shows similarity with 03fg-like. 14:48:38.815 +18:16:34.99 SN Ia-SC 0.04
TNS 2026ndk [ATLAS26gcd] 00:53:50.253 -67:36:34.49 SN II 0.031 WISEA J005350.62-673633.1 0.031 ATLAS Host-galaxy spectral lines were used to determine the redshift. The observed spectrum appears blue. 00:53:50.253 -67:36:34.49 SN II 0.031

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